As a long-term member of the postfix community, allow me to draw your
attention to the new serious change in CentOS Linux.
Not quite a postfix issue, but an important (negative IMHO) development
in the open source community.
You might want to read:
https://blog.centos.org/2020/12/future-is-centos-stream
A petition has started on this:
https://www.change.org/p/centos-governing-board-do-not-destroy-centos-by-using-it-as-a-rhel-upstream
If you agree, you may want to sign/forward.
With due respect to the community,
Nick Milas
National Observatory of Athens
Greece